body {
    background-color: burlywood;
}

.box {
    background-color: #ffffff;
    height: 160px;
    width: 160px;
    border-width: 2px;
    border-style: solid;
    border-color: chocolate;
    margin: 5px;
    display: inline-block;
}

.drag {
    height: 150px;
    width: 150px;
    margin: 4px;
    background-image: url("https://source.unsplash.com/random/150x150");
    display: block;
    border: 1px solid grey;
    cursor: pointer;
}

.drag-hold {
    border: 2px solid black;
}

.drag-opacity {
    opacity: 0.6;
}

.box-drag-enter {
    border-style: dashed;
    background-color: gray;
}